I just found that in 1970, Heathkit came out with a 1/8 scale GT40 RC car. It was the first successful R/C car. It had a small gas/petrol engine in back (mid-engine like the original, but transverse mounted). It's the Heathkit Spectre GD-101. According to the ad, it has a top speed of 25 mph. The price for the car was $50. The engine was $30 and if you needed the electronics, it was another $130. R/C planes were common then, so it's possible that someone might already have the engine and electronics.
Here's an article about the R/C car with some photos and history.
https://www.tamiyaclub.com/showroom_model.asp?cid=140936&id=22039
And another
https://www.tamiyaclub.com/showroom_model.asp?cid=50177
Here's an article about the R/C car with some photos and history.
https://www.tamiyaclub.com/showroom_model.asp?cid=140936&id=22039
And another
https://www.tamiyaclub.com/showroom_model.asp?cid=50177
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